As we move towards micron-scale rapid manufacturing, it is critical to understand build resolution of Stereolithography technology. In order to determine the resolution limitations, positive and negative features on Stereolithography parts were built and analyzed. Results from several experiments were compared to an analytical model and important resolution issues are highlighted. Based on thes...

Though the presence of vasa vasorum in the walls of arteries and veins has been recognized for almost 200 years, relatively little is known about their precise function and their r6le in vascular repair. There has been much controversy in the literature as to whether there is a causal relationship between disease of the vasa and of the parent vessels, or whether alterations in the vasa are seco...

Laboratory magnetic reconnection experiments have been performed for nearly 20 years. Elegant experiments by Stenzel and Gekelman @R. L. Stenzel and W. Gekelman, Phys. Rev. Lett. 42, 1055 ~1979!; W. Gekelman and R. L. Stenzel, Phys. Rev. Lett. 54, 2414 ~1985!# focused on the measurement of field quantities with a single movable probe in a highly reproducible plasma. Observations included a very...

Experimental Approaches in Migration Studies The decision of whether or not to migrate has far-reaching consequences for the lives of individuals and their families. But the very nature of this choice makes identifying the impacts of migration difficult, since it is hard to measure a credible counterfactual of what the person and their household would have been doing had migration not occurred....

Cholesterol dissolved in sesame oil and injected regularly for a period of from 7 to 8 months into the jugular vein of four young dogs has caused in each animal larger and smaller nodules protruding to some degree into the lumen of the pulmonary artery and also here and there some diffuse thickenings, the whole closely resembling human arteriosclerosis. These changes commence at the origin of t...

Diffraction of a normal shock wave has been the subject of numerous studies, dating back work of Whitham [1]. A large number of the complex flow features present were highlighted in the well known work by Skews [2]. Fig. 1 shows the flow features behind a strong shock diffracting around a sharp corner. Skews showed that for angles greater than 75o the flow features become independent of the cor...

A new method has been described for the study in vivo of thrombus formation in blood circulating extracorporeally in an artificial loop. This method permits of control of many factors, and hence of intensive study of thrombus formation under many and varied conditions. It admits of separate study of the formation of white thrombi and of the deposition of fibrin, which may apparently be independ...